Embroidery-machine.



M. SCHOENFELD.

EMBROIDERY MACHINE.

APPLICATION FILED MAR. 16, 1916.

Patentedl Dec. 4', 1917.

2 SHEETS-SHEET ll/vvEA/Tom: MORRIS SCHOE/VFELD ATTOR-NEV M. SCHOENFELD.

EMBROIDERY MACHINE. APPLICATION FILED MAR- 16| I9l6.

Patnted 10%. 4, 191? 2 SHEETS-SHEET 2- SCHOENFELU.

nn ears en lo.

MORRIS SCHOENFELD, 0F ROBSCI-IACH, SWITZERLAND.

EMBROIDERY-MACHINE.

Application filed March 16, 1916.

to cause the bore points to stitch into the fabric over a variable working stroke, in order to permanently maintain the same stitch depth for the bore tools, that isthe piercing bore points and the rounded bore points.

a This measure is based on the fact that generally the piercing bore points are shortened by their sharpening from time to time for maintaining the sharpness of their cutting edges, while the rounded bore points (stupfel points) maintain their original length.

Consequently, as long as the piercing borers are new and not shortened by their sharpening, they will perform a correct movement and stitch into the fabric with always the same depth (considered from the point end of the borers) as the rounded or stupfel borers. It can therefore be assumedthat both the tools perform the correct working stroke. These conditions will, however, be changed when the piercing borers have been sharpened. Then, the piercing borers penetrate into the fabric at a smaller depth and it is necessary to otherwise adjust the usually adjustable borer drive mechanism for the transition from the boring to the stupfel operation, which, in the case of a manually controlled embroidery machine, is

very troublesome, while in the case of an automatic machine this maintaining of unvariable stitch depth is only possible by a continuous changing of the pattern card or of its holes therein. As on the other hand the borers of'one machine are not of the same size as that of another machine, it would be necessary, in this latter case, to continuously change the pattern cards, if the patterns are transferred from one machine to another, and it may be possible that at least the first embroidery row on a machine becomes faulty or of less value, until the pattern card has been corrected.

The present invention relates to a borer and stupfel device for embroidery machines, wherein the piercing borers and the stupfel points for each embroidery row are driven Specification of Letters Patent.

Patented Dec, 4, mm. Serial No. 84,612.

by a common rocking shaft which can a1- ternately be coupled with the two tool groups, According to the present invention, a driving mechanism acting for both tool groups with one and the same fundamental stroke is connected with the common rocking shaft by means of the one or other of 7 two independently adjustable couplers, ac-

cording as the plerclng borers or the stupfel points shall perform their working movement, whereby the said couplers, ac-

cording to their adjustment, allow of increasing or reducing the angular stroke of the rocking shaft, and this ata different ratio for the two tool devices.

Advantageously the construction is such that the said couplersare liable of being alternately coupled with a slotted lever on the rocking shaft and so arranged with re gard to the latter that they can be brought near to said shaft or withdrawn therefrom.

independently from each other, so that with unvariably the same fundamental driving movement the amplitude of movement of the rocking shaft can be varied as required.

In a structure wherein the rocking shaft is at the same time axially shiftable in the one or: other direction for being coupled with the borer device or the stupfel device, provision can be made that the same axial shifting motion of the rocking shaft which serves for thealternate engagement and disengagement of the two tool devices, may also be used of for the coupling of aforesaid sllotted lever with the one or the other coup er.

The accompanying drawing represents a convenient constructional form of the subject of the present invention.

lgigure 1 is a partial front view thereof an Fig. 2 a corresponding side elevation, partly in section.

1 indicates the frame of a two-row embroidery machine, 2 the needle bar for a lower embroidery row. 3 indicates the sharp piercing borers on the borer bar 4. carried by the sliding rods 5 provided each with a coupling dog 6 engaged by a bowl 7 of the lever arm 8 fixed on the rocking shaft 9 which is common to the borer and stupfel tools. The stupfel points 10 are mounted on the stupfel bar 11 carried by sliding rods 12 provided each with a coupling dog 13, which can be engaged by the bowl 14C of a lever arm 15 fixed on therocking shaft ,9,-

when the rocking and also axially shiftable shaft 9 is shifted in axial direction. In the position of the parts as represented, the borer tools are coupled with the rocking 5 shaft 9. If the latter is shifted to the right (Fig. 1), the stupfel tools will be coupled with the rocking shaft 9 and the borer tools disengaged therefrom. This alternate engaging and disengaging of the borer. and stupfel system with respect to the common rocking shaft 9 is well known. The rockmg shafts 9 corresponding to both embroidery ,rows are connected together by means of arms 16 and a link rod 17 The axial displacement of the rocking shaft 9 is effected by an upright shaft 18 fulcrumed in brackets 19'on the machine frame and provided with eccentrics or cam disks 20 located be tween collars 21 fixed on the shafts 9, so that an angular movement of the controlling shaft 18 obtained by means of the actuating rod 18 will cause an axial shifting motion of the rocking shafts 9 in the one and other direction. 7

The operation of the tools is produced by a driving mechanism comprising a slotted lever 22 fixed on the upper rocking shaft 9, which can be brought into positive engagement at the left hand with a coupler 23 and at the right hand with a coupler 24:, accordingas the shaft 9 is shifted to the left or to the right (Fig. 1). The couplers V 23, 2e are mounted as adjustable slides in slots of a forked rod 25 so as to be adjustable independently from each other; in the drawing, this adjustment is simply obtained by means of a manually operatable clamping screw system, but'it could also be produced by any convenient controlling mechanism. In this way, the slidable couplers 23, 24c can be adjusted at a different ratio with respect to each other nearer to or farther from the shaft 9, as required. The connecting rod 25 is guided at its upper end by a link 26 pivoted on the machine frame. At its lower end, the rod 25 engages by a slide piece 27 into a driving slotted wing 28 fulcrumed at 28 on the machine frame and driven through the link rod 29 by a crank arm 30 fixed on the auxiliary shaft 31 having its own drive and receiving therefrom a rapid rotating movement. To the rod 25 is linked an adjusting rod 32 movable either by the Jacquard apparatus or by hand and allowing of variation of the stroke of the fundamental or driving movement imparted to the rod 25, according as the rod 25 is adjusted nearer to or farther from the oscillating point 28 of the driving wing 28. To stop the operation of the borer and stupfel device, the slide piece 27 is adjusted on the oscillating point 28 of the driving wing 28.

Obviously, the present invention may be applied to pantograph controlled machines 65 as well-as to automatic machines.

What I claim is:

1. In an embroidery machine, a borer device, a stupfel device, a common rocking shaft for alternately operating said borer and stupfel devices, coupling means for alternately coupling the latter with said rocking shaft, a main drive mechanism for said rocking shaft, a connecting member connected with said drive mechanism, a connecting member mounted on said rocking shaft, two couplers on one of said connect ing members, adjustable thereon independently from each other, and means interconnected with said coupling means for effecting positive connection between said connect- 0 ing members through one or other of said couplers according to the coupling of the rocking shaft with the borer or the stupfel device, substantially as described.

2. In an embroidery machine, a borer device, a stupfel device, a common rocking shaft for alternately operating said borer and stupfel devices, coupling means for alternately coupling the latter with said rocking shaft, a main drive mechanism for said rocking shaft, a movable connecting rod connected to said drive mechanism, two couplers on said connecting rod adjustable thereon independently from each other, a connecting lever arm on the rocking shaft and means interconnected with said coupling means for effecting positive connection between said connecting rod and lever arm through one or other of said couplers ac cording to the coupling of the rocking shaft with the borer or the stupfel device, substantially as described.

3. In an embroidery machine, a borer device, a stupfel device, a common rocking shaft for alternately operating said borer and stupfel devices, coupling means for alternately coupling the latter with said rocking shaft, a main drive mechanism for said rocking shaft, a movable connecting rod connected to said drive mechanism and having two slotted parts, two couplers in form of sliding pieces independently adjustable respectively in the slotted parts of said rod,

a slotted connectin lever arm on the rocking shaft for alternate y receiving one or other of said couplers, and means interconnected with said coupling means for effecting positive connection between said connecting rod and lever arm through one or other of said couplers according to the coupling of the rocking shaft with the borer or the stupfel device, substantially as described.

4. In an embroidery machine, a borer de- -vice, a stupfel device, a common rocking shaft for alternately operating said borer and stupfel devices, said rocking shaft being also axially displaceable, means for axially shifting said shaft in one or other direction, coupling members for alternately coupling the rocking shaft with the borer or the stupfel device when said shaft is axially shifted in one or other direction, a main drive mechanism for the rocking shaft to impart operative movement thereto, a connecting member connected to said drive mechanism, a connecting member fixed to the rocking and also axially shiftable shaft, and two couplers on one of said connecting members, adjustable thereon independently from each other and so arranged with respect to the other connecting member as to be alternately engaged therewith when the rocking shaft is axially shifted for its coupling with the borer or the stupfel device, substantially as described.

In witness whereof I have hereunto signed my name this 14th day of February 1916, in the presence of two subscribing witnesses.

MORRIS SOHOENFELD.

Witnesses:

FRANK DIMENKE, EMIL MEILE.

Monies of this patent may he obtained for five cents each, by addressing the Uommisstoner of Patents, Waehinn, D. W 

